1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 229Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 229

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Troubleshooting Determining if Problem is Electrical or Hydraulic
Refer to "Hydraulic System Troubleshooting

Engine will not hold trimmed position or will not remain tilted for any